The European Union has imposed fresh sanctions on Syrian President Bashar al-Assad's regime over its 15-month-long crackdown on the opposition.

The step came after Syrian armed forces on June 22 shot down a military plane of NATO ally Turkey.

The EU said foreign ministers at a meeting in Luxembourg agreed on sanctions targeting one Syrian individual and six entities.

There were no immediate details on those targeted.

With the additions, a total of 129 individuals and 49 entities in Syria are now subject to EU sanctions.

"What had happened with the jet plane is very dangerous," Luxembourg Foreign Minister Jean Asselborn told journalists before the meeting. "This shows a total disrespect for human life. There were two pilots in the plane and to shoot it down without prior warning is something that I think only can happen in a dictatorship."